/** Function to handle the @ref KBASE_PM_EVENT_SYSTEM_RESUME message for the always_on power policy.
*
* This function is called when a @ref KBASE_PM_EVENT_SYSTEM_RESUME message is received. It instructs the GPU to turn on all
* the cores.
*
* @param kbdev The kbase device structure for the device
*/
static void always_on_resume(kbase_device *kbdev)
{
u64 cores;
/* Inform the system that the transition has started */
kbase_pm_power_transitioning(kbdev);
/* Turn the clock on */
kbase_pm_clock_on(kbdev);
/* Enable interrupts */
kbase_pm_enable_interrupts(kbdev);
/* Turn the cores on */
cores = kbase_pm_get_present_cores(kbdev, KBASE_PM_CORE_SHADER);
kbase_pm_invoke_power_up(kbdev, KBASE_PM_CORE_SHADER, cores);
cores = kbase_pm_get_present_cores(kbdev, KBASE_PM_CORE_TILER);
kbase_pm_invoke_power_up(kbdev, KBASE_PM_CORE_TILER, cores);
kbase_pm_check_transitions(kbdev);
kbdev->pm.policy_data.always_on.state = KBASEP_PM_ALWAYS_ON_STATE_POWERING_UP;
/* Ensure that the OS is informed even if we didn't do anything */
always_on_state_changed(kbdev);
}
/** Turn some cores on/off.
*
* This function turns on/off the cores needed by the scheduler.
*/
static void demand_change_gpu_state(kbase_device *kbdev)
{
/* Update the bitmap of the cores we need */
kbdev->pm.desired_shader_state = kbdev->shader_needed_bitmap;
kbdev->pm.desired_tiler_state = kbdev->tiler_needed_bitmap;
kbase_pm_check_transitions(kbdev);
}
/** Turns the cores on.
*
* This function turns all the cores of the GPU on.
*/
static void demand_power_up(kbase_device *kbdev)
{
/* Inform the system that the transition has started */
kbase_pm_power_transitioning(kbdev);
/* Turn clocks and interrupts on */
kbase_pm_clock_on(kbdev);
kbase_pm_enable_interrupts(kbdev);
kbase_pm_check_transitions(kbdev);
kbdev->pm.policy_data.demand.state = KBASEP_PM_DEMAND_STATE_POWERING_UP;
}
/** Turn the cores off.
*
* This function turns all the cores of the GPU off.
*/
static void demand_power_down(kbase_device *kbdev)
{
u64 cores;
/* Inform the system that the transition has started */
kbase_pm_power_transitioning(kbdev);
/* Turn the cores off */
cores = kbase_pm_get_present_cores(kbdev, KBASE_PM_CORE_SHADER);
kbase_pm_invoke_power_down(kbdev, KBASE_PM_CORE_SHADER, cores);
cores = kbase_pm_get_present_cores(kbdev, KBASE_PM_CORE_TILER);
kbase_pm_invoke_power_down(kbdev, KBASE_PM_CORE_TILER, cores);
kbdev->pm.policy_data.demand.state = KBASEP_PM_DEMAND_STATE_POWERING_DOWN;
kbase_pm_check_transitions(kbdev);
}
/** The event callback function for the always_on power policy.
*
* This function is called to handle the events for the power policy. It calls the relevant handler function depending
* on the type of the event.
*
* @param kbdev The kbase device structure for the device
* @param event The event that should be processed
*/
static void always_on_event(kbase_device *kbdev, kbase_pm_event event)
{
kbasep_pm_policy_always_on *data = &kbdev->pm.policy_data.always_on;
switch (event) {
case KBASE_PM_EVENT_SYSTEM_SUSPEND:
always_on_suspend(kbdev);
break;
case KBASE_PM_EVENT_POLICY_INIT: /* Init is the same as resume for this policy */
case KBASE_PM_EVENT_SYSTEM_RESUME:
always_on_resume(kbdev);
break;
case KBASE_PM_EVENT_GPU_STATE_CHANGED:
always_on_state_changed(kbdev);
break;
case KBASE_PM_EVENT_POLICY_CHANGE:
if (data->state == KBASEP_PM_ALWAYS_ON_STATE_POWERED_UP || data->state == KBASEP_PM_ALWAYS_ON_STATE_POWERED_DOWN)
kbase_pm_change_policy(kbdev);
else
data->state = KBASEP_PM_ALWAYS_ON_STATE_CHANGING_POLICY;
break;
case KBASE_PM_EVENT_GPU_ACTIVE:
case KBASE_PM_EVENT_GPU_IDLE:
break;
case KBASE_PM_EVENT_CHANGE_GPU_STATE:
/*
* Note that the GPU is always kept on, however we still may
* be required to update anyone waiting for power up events.
*/
kbase_pm_check_transitions(kbdev);
break;
default:
/* Unrecognised event - this should never happen */
KBASE_DEBUG_ASSERT(0);
}
}
/** The event callback function for the coarse_demand power policy.
*
* This function is called to handle the events for the power policy. It calls the relevant handler function depending
* on the type of the event.
*
* @param kbdev The kbase device structure for the device
* @param event The event that should be processed
*/
static void coarse_demand_event(kbase_device *kbdev, kbase_pm_event event)
{
kbasep_pm_policy_coarse_demand *data = &kbdev->pm.policy_data.coarse_demand;
switch(event)
{
case KBASE_PM_EVENT_POLICY_INIT:
coarse_demand_power_up(kbdev);
break;
case KBASE_PM_EVENT_SYSTEM_SUSPEND:
switch (data->state)
{
case KBASEP_PM_COARSE_DEMAND_STATE_POWERING_DOWN:
break;
case KBASEP_PM_COARSE_DEMAND_STATE_POWERED_DOWN:
kbase_pm_power_down_done(kbdev);
break;
default:
coarse_demand_suspend(kbdev);
}
break;
case KBASE_PM_EVENT_GPU_IDLE:
switch (data->state)
{
case KBASEP_PM_COARSE_DEMAND_STATE_POWERING_DOWN:
break;
case KBASEP_PM_COARSE_DEMAND_STATE_POWERED_DOWN:
kbase_pm_power_down_done(kbdev);
break;
default:
coarse_demand_power_down(kbdev);
}
break;
case KBASE_PM_EVENT_GPU_ACTIVE:
case KBASE_PM_EVENT_SYSTEM_RESUME:
switch (data->state)
{
case KBASEP_PM_COARSE_DEMAND_STATE_POWERING_UP:
break;
case KBASEP_PM_COARSE_DEMAND_STATE_POWERED_UP:
kbase_pm_power_up_done(kbdev);
break;
default:
coarse_demand_power_up(kbdev);
}
break;
case KBASE_PM_EVENT_GPU_STATE_CHANGED:
coarse_demand_state_changed(kbdev);
break;
case KBASE_PM_EVENT_POLICY_CHANGE:
if (data->state == KBASEP_PM_COARSE_DEMAND_STATE_POWERED_UP ||
data->state == KBASEP_PM_COARSE_DEMAND_STATE_POWERED_DOWN)
{
kbase_pm_change_policy(kbdev);
}
else
{
data->state = KBASEP_PM_COARSE_DEMAND_STATE_CHANGING_POLICY;
}
break;
case KBASE_PM_EVENT_CHANGE_GPU_STATE:
if (data->state != KBASEP_PM_COARSE_DEMAND_STATE_POWERED_DOWN &&
data->state != KBASEP_PM_COARSE_DEMAND_STATE_POWERING_DOWN)
{
/*
* Update anyone waiting for power up events.
*/
kbase_pm_check_transitions(kbdev);
}
break;
default:
/* Unrecognised event - this should never happen */
OSK_ASSERT(0);
}
}
